DEVICES AND METHODS FOR SENSING TOUCHING CORRECTLY DESPITE VARIABLE ENVIRONMENTS

A contact sensing sensor and the sensing method is provided to minimize the analog circuit and reduce the malfunction of the contact sensing sensor. The contact sensing sensor is comprised of clock signal generator, clock control part, and the control shift part and counter. The clock signal generator outputs the clock signal. The clock control part divides the clock signal to the predetermined rate and outputs the clock signal scaling. The control shift part outputs the count enable determined according to the time delay between the divided clock signal and the delay clock signal. The clock signal and count enable are input to the counter. The counter counts the clock count of the clock signal and senses the contact of the touch pad through the counted clock count.